QJEEM07Ch369b: JEE Main 2007 Chemistry - Class 12 JEEM07Ch369b Solution: Which one of the following is the strongest base in aqueous…

NOTE : Aromatic amines are less basic than aliphatic amines. Among aliphatic amines the order of basicity is $$2^{\circ }>1^{\circ }>3^{\circ }.$$ The electron density is decreased in $$3^{\circ }$$ amine due to crowing of alkyl group over $$N$$ atom which makes the approach and bonding by a proton relatively difficult. Therefore the basicity decreases. Further Phenyl group show $$-\mathrm{I}$$ effect, thus decreases the electron density on nitrogen atom and hence the basicity.

$$\therefore$$ dimethylamine ($$2^{\circ }$$ aliphatic amine) is strongest base among gtiven choices.

$$\therefore$$ The correct order of basic strength is Dimethyl amine $$>$$ Methyl amine $$>$$ Trimethyl-amine $$>$$ Aniline.